안 드 로 이 드 는 카 메 라 를 호출 하여 사진 을 찍 는 기능 을 실현 한다.
아래 프로그램 데모 인 스 턴 스 는 카메라 v2 를 사용 하여 사진 을 찍 는 것 을 시범 하 였 으 며,사용자 가 사진 버튼 을 눌 렀 을 때 이 앱 은 자동 으로 초점 을 맞 추고 초점 이 성공 할 때 사진 을 찍 는 다.
layout/activity_main.xml 인터페이스 레이아웃 코드 는 다음 과 같 습 니 다.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.fukaimei.camerav2test">
<!-- -->
<uses-permission android:name="android.permission.CAMERA" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
AutoFitTextureView.자바 논리 코드 는 다음 과 같 습 니 다.
package com.fukaimei.camerav2test;
import android.content.Context;
import android.util.AttributeSet;
import android.view.TextureView;
/**
* Created by FuKaimei on 2017/9/29.
*/
public class AutoFitTextureView extends TextureView {
private int mRatioWidth = 0;
private int mRatioHeight = 0;
public AutoFitTextureView(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void setAspectRatio(int width, int height) {
mRatioWidth = width;
mRatioHeight = height;
requestLayout();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = MeasureSpec.getSize(widthMeasureSpec);
int height = MeasureSpec.getSize(heightMeasureSpec);
if (0 == mRatioWidth || 0 == mRatioHeight) {
setMeasuredDimension(width, height);
} else {
if (width < height * mRatioWidth / mRatioHeight) {
setMeasuredDimension(width, width * mRatioHeight / mRatioWidth);
} else {
setMeasuredDimension(height * mRatioWidth / mRatioHeight, height);
}
}
}
}
MainActivity.java 논리 코드 는 다음 과 같 습 니 다.
package com.fukaimei.camerav2test;
import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.content.res.Configuration;
import android.graphics.ImageFormat;
import android.graphics.SurfaceTexture;
import android.hardware.camera2.CameraAccessException;
import android.hardware.camera2.CameraCaptureSession;
import android.hardware.camera2.CameraCharacteristics;
import android.hardware.camera2.CameraDevice;
import android.hardware.camera2.CameraManager;
import android.hardware.camera2.CameraMetadata;
import android.hardware.camera2.CaptureRequest;
import android.hardware.camera2.TotalCaptureResult;
import android.hardware.camera2.params.StreamConfigurationMap;
import android.media.Image;
import android.media.ImageReader;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v4.app.ActivityCompat;
import android.util.Log;
import android.util.Size;
import android.util.SparseIntArray;
import android.view.Surface;
import android.view.TextureView;
import android.view.View;
import android.widget.Toast;
import java.io.File;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public class MainActivity extends Activity implements View.OnClickListener {
private static final SparseIntArray ORIENTATIONS = new SparseIntArray();
private static final String TAG = "MainActivity";
static {
ORIENTATIONS.append(Surface.ROTATION_0, 90);
ORIENTATIONS.append(Surface.ROTATION_90, 0);
ORIENTATIONS.append(Surface.ROTATION_180, 270);
ORIENTATIONS.append(Surface.ROTATION_270, 180);
}
private AutoFitTextureView textureView;
// ID（ 0 ，1 ）
private String mCameraId = "0";
//
private CameraDevice cameraDevice;
//
private Size previewSize;
private CaptureRequest.Builder previewRequestBuilder;
//
private CaptureRequest previewRequest;
// CameraCaptureSession
private CameraCaptureSession captureSession;
private ImageReader imageReader;
private final TextureView.SurfaceTextureListener mSurfaceTextureListener
= new TextureView.SurfaceTextureListener() {
@Override
public void onSurfaceTextureAvailable(SurfaceTexture texture
, int width, int height) {
// TextureView ，
openCamera(width, height);
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture texture
, int width, int height) {
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture texture) {
return true;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture texture) {
}
};
private final CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() {
//
@Override
public void onOpened(CameraDevice cameraDevice) {
MainActivity.this.cameraDevice = cameraDevice;
//
createCameraPreviewSession(); // ②
}
//
@Override
public void onDisconnected(CameraDevice cameraDevice) {
cameraDevice.close();
MainActivity.this.cameraDevice = null;
}
//
@Override
public void onError(CameraDevice cameraDevice, int error) {
cameraDevice.close();
MainActivity.this.cameraDevice = null;
MainActivity.this.finish();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textureView = (AutoFitTextureView) findViewById(R.id.texture);
//
textureView.setSurfaceTextureListener(mSurfaceTextureListener);
findViewById(R.id.capture).setOnClickListener(this);
}
@Override
public void onClick(View view) {
captureStillPicture();
}
private void captureStillPicture() {
try {
if (cameraDevice == null) {
return;
}
// CaptureRequest.Builder
final CaptureRequest.Builder captureRequestBuilder =
cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_STILL_CAPTURE);
// imageReader surface CaptureRequest.Builder
captureRequestBuilder.addTarget(imageReader.getSurface());
//
captureRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
//
captureRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE,
CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
//
int rotation = getWindowManager().getDefaultDisplay().getRotation();
//
captureRequestBuilder.set(CaptureRequest.JPEG_ORIENTATION
, ORIENTATIONS.get(rotation));
//
captureSession.stopRepeating();
//
captureSession.capture(captureRequestBuilder.build()
, new CameraCaptureSession.CaptureCallback() // ⑤
{
//
@Override
public void onCaptureCompleted(CameraCaptureSession session
, CaptureRequest request, TotalCaptureResult result) {
try {
//
previewRequestBuilder.set(CaptureRequest.CONTROL_AF_TRIGGER,
CameraMetadata.CONTROL_AF_TRIGGER_CANCEL);
//
previewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE,
CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
//
captureSession.setRepeatingRequest(previewRequest, null,
null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
}, null);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
//
private void openCamera(int width, int height) {
setUpCameraOutputs(width, height);
CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
//
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
manager.openCamera(mCameraId, stateCallback, null); // ①
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
private void createCameraPreviewSession() {
try {
SurfaceTexture texture = textureView.getSurfaceTexture();
texture.setDefaultBufferSize(previewSize.getWidth(), previewSize.getHeight());
Surface surface = new Surface(texture);
// CaptureRequest.Builder
previewRequestBuilder = cameraDevice
.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
// textureView surface CaptureRequest.Builder
previewRequestBuilder.addTarget(new Surface(texture));
// CameraCaptureSession，
cameraDevice.createCaptureSession(Arrays.asList(surface
, imageReader.getSurface()), new CameraCaptureSession.StateCallback() // ③
{
@Override
public void onConfigured(CameraCaptureSession cameraCaptureSession) {
// null，
if (null == cameraDevice) {
return;
}
// ，
captureSession = cameraCaptureSession;
try {
//
previewRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE,
CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE);
//
previewRequestBuilder.set(CaptureRequest.CONTROL_AE_MODE,
CaptureRequest.CONTROL_AE_MODE_ON_AUTO_FLASH);
//
previewRequest = previewRequestBuilder.build();
//
captureSession.setRepeatingRequest(previewRequest,
null, null); // ④
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(CameraCaptureSession cameraCaptureSession) {
Toast.makeText(MainActivity.this, " ！"
, Toast.LENGTH_SHORT).show();
}
}, null
);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
private void setUpCameraOutputs(int width, int height) {
CameraManager manager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
try {
//
CameraCharacteristics characteristics
= manager.getCameraCharacteristics(mCameraId);
//
StreamConfigurationMap map = characteristics.get(
CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
//
Size largest = Collections.max(
Arrays.asList(map.getOutputSizes(ImageFormat.JPEG)),
new CompareSizesByArea());
// ImageReader ，
imageReader = ImageReader.newInstance(largest.getWidth(), largest.getHeight(),
ImageFormat.JPEG, 2);
imageReader.setOnImageAvailableListener(
new ImageReader.OnImageAvailableListener() {
//
@Override
public void onImageAvailable(ImageReader reader) {
//
Image image = reader.acquireNextImage();
ByteBuffer buffer = image.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.remaining()];
// IO
File file = new File(getExternalFilesDir(null), "pic.jpg");
buffer.get(bytes);
try (
FileOutputStream output = new FileOutputStream(file)) {
output.write(bytes);
Toast.makeText(MainActivity.this, " : " + file, Toast.LENGTH_LONG).show();
} catch (Exception e) {
e.printStackTrace();
} finally {
image.close();
}
}
}, null);
//
previewSize = chooseOptimalSize(map.getOutputSizes(
SurfaceTexture.class), width, height, largest);
// （TextureView ）
int orientation = getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
textureView.setAspectRatio(
previewSize.getWidth(), previewSize.getHeight());
} else {
textureView.setAspectRatio(
previewSize.getHeight(), previewSize.getWidth());
}
} catch (CameraAccessException e) {
e.printStackTrace();
} catch (NullPointerException e) {
Log.d(TAG, " ");
}
}
private static Size chooseOptimalSize(Size[] choices
, int width, int height, Size aspectRatio) {
// Surface
List<Size> bigEnough = new ArrayList<>();
int w = aspectRatio.getWidth();
int h = aspectRatio.getHeight();
for (Size option : choices) {
if (option.getHeight() == option.getWidth() * h / w &&
option.getWidth() >= width && option.getHeight() >= height) {
bigEnough.add(option);
}
}
// ， 。
if (bigEnough.size() > 0) {
return Collections.min(bigEnough, new CompareSizesByArea());
} else {
System.out.println(" ！！！");
return choices[0];
}
}
// Size Comparator
static class CompareSizesByArea implements Comparator<Size> {
@Override
public int compare(Size lhs, Size rhs) {
// long
return Long.signum((long) lhs.getWidth() * lhs.getHeight() -
(long) rhs.getWidth() * rhs.getHeight());
}
}
}
메모:이 프로그램 은 핸드폰 카 메 라 를 사용 해 야 하기 때문에 목록 파일 AndroidManifest.xml 파일 에 해당 하 는 권한 을 부여 해 야 합 니 다.
<!-- -->
<uses-permission android:name="android.permission.CAMERA" />
데모 프로그램 원본 코드다운로드 주소
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